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Mansion room

The Cosmos Club offers overnight accommodations for members, sponsored guests of members, and members of Reciprocal Clubs.

All overnight rooms and suites have private bathrooms, security safe, cable television, high-speed internet access and wifi. A full complimentary breakfast for two is included with every overnight stay as is a copy of the Washington Post delivered to their door. Parking is also available for a nominal charge.

Members and guests may check in anytime after 3:00 p.m. and check out time is at 12:00 p.m. Requests can be made for early check in or late check out depending upon availability. Following your arrival, please inquire with one of the Front Desk staff. All cancellations must be submitted no later than 24 hours in advance of the date of your reservation to avoid being charged in full.

It is our goal that your stay at the Cosmos Club be a most enjoyable one.

Room Reservations

To check availability and request a room reservation, please call 202-387-7783, or send an email to